Review: Preventing Web Attacks with Apache

I've been studying Apache security lately and ran across a very good book on it written by Ryan Barnett called "Preventing Web Attacks with Apache". I am really impressed with this book that was published in 2006. Barnett covers things that I didn't even know existed in Apache before I started reading this. I have the O'Rielly book "Apache Security" and have to say that this book so far outstrips the O'Rielly book that it isn't even funny. To be fair "Apache Security" doesn't cover much to do with web application security, and the Barnett book covers it in depth.